【Android】带可输入功能的下拉框EditSpinner，附带Filter功能

功能实现，分为前期准备+使用。

1、前期准备

在model下建立一个spinner包文件夹，在这个文件夹中添加4个java文件：
1、BaseEditSpinnerAdapter.java

import android.widget.BaseAdapter;

public abstract class BaseEditSpinnerAdapter extends BaseAdapter {
    /**
     * editText输入监听
     * @return
     */
    public abstract EditSpinnerFilter getEditSpinnerFilter();

    /**
     * 获取需要填入editText的字符串
     * @param position
     * @return
     */
    public abstract String getItemString(int position);

}

2、EditSpinnerFilter.java

public interface EditSpinnerFilter {
    /**
     * editText输入监听
     * @param keyword
     * @return
     */
    boolean onFilter(String keyword);
}

3、SimpleAdapter.java

import android.content.Context;
import android.text.Html;
import android.text.TextUtils;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

import java.util.ArrayList;
import java.util.List;

public class SimpleAdapter extends BaseEditSpinnerAdapter implements EditSpinnerFilter {
    private Context mContext;
    private List<String> mSpinnerData;
    private List<String> mCacheData;
    private int[] indexs;

    public SimpleAdapter(Context context, List<String> spinnerData) {
        this.mContext = context;
        this.mSpinnerData = spinnerData;
        mCacheData = new ArrayList<>(spinnerData);
        indexs = new int[mSpinnerData.size()];
    }

    @Override
    public EditSpinnerFilter getEditSpinnerFilter() {
        return this;
    }

    @Override
    public String getItemString(int position) {
        return mSpinnerData.get(indexs[position]);
    }

    @Override
    public int getCount() {
        return mCacheData == null ? 0 : mCacheData.size();
    }

    @Override
    public String getItem(int position) {
        return mCacheData == null ? "" : mCacheData.get(position) == null ? "" : mCacheData.get(position);
    }

    @Override
    public long getItemId(int position) {
        return position;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        TextView textView = null;
        if (convertView == null) {
            textView = (TextView) LayoutInflater.from(mContext).inflate(android.R.layout.simple_spinner_item, null);
        } else {
            textView = (TextView) convertView;
        }
        textView.setText(Html.fromHtml(getItem(position)));
        return textView;
    }

    @Override
    public boolean onFilter(String keyword) {
        mCacheData.clear();
        if (TextUtils.isEmpty(keyword)) {
            mCacheData.addAll(mSpinnerData);
            for (int i = 0; i < indexs.length; i++) {
                indexs[i] = i;
            }
        } else {
            StringBuilder builder = new StringBuilder();
            builder.append("[^\\s]*").append(keyword).append("[^\\s]*");
            for (int i = 0; i < mSpinnerData.size(); i++) {
                if (mSpinnerData.get(i).replaceAll("\\s+", "|").matches(builder.toString())) {
                    indexs[mCacheData.size()] = i;
                    mCacheData.add(mSpinnerData.get(i).replaceFirst(keyword, "<font color=\"#aa0000\">" + keyword + "</font>"));
                }
            }
        }
        notifyDataSetChanged();
        return mCacheData.size() <= 0;
    }
}

4、EditSpinner.java

import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.drawable.Drawable;
import android.support.annotation.ColorInt;
import android.support.annotation.DrawableRes;
import android.text.Editable;
import android.text.TextUtils;
import android.text.TextWatcher;
import android.util.AttributeSet;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.WindowManager;
import android.view.animation.Animation;
import android.view.animation.RotateAnimation;
import android.widget.AdapterView;
import android.widget.BaseAdapter;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.ListPopupWindow;
import android.widget.PopupWindow;
import android.widget.RelativeLayout;

import java.util.List;

public class EditSpinner extends RelativeLayout implements View.OnClickListener, AdapterView.OnItemClickListener, TextWatcher {
    private EditText editText;
    private ImageView mRightIv;
    private View mRightImageTopView;
    private Context mContext;
    private ListPopupWindow popupWindow;
    BaseEditSpinnerAdapter adapter;
    private TypedArray tArray;
    private boolean isPopupWindowShowing;
    private Animation mAnimation;
    private Animation mResetAnimation;

    public EditSpinner(Context context, AttributeSet attrs) {
        super(context, attrs);
        this.mContext = context;
        initView(attrs);
        initAnimation();
    }

    public void setItemData(List<String> data) {
        adapter = new SimpleAdapter(mContext, data);
        setAdapter(adapter);
    }

    public void setText(String text) {
        editText.setText(text);
    }

    public void setTextColor(@ColorInt int color) {
        editText.setTextColor(color);
    }

    public String getText() {
        return editText.getText().toString();
    }

    public void setHint(String hint) {
        editText.setHint(hint);
    }

    public void setRightImageDrawable(Drawable drawable) {
        mRightIv.setImageDrawable(drawable);
    }

    public void setRightImageResource(@DrawableRes int res) {
        mRightIv.setImageResource(res);
    }

    public void setAdapter(BaseEditSpinnerAdapter adapter) {
        this.adapter = adapter;
        setBaseAdapter(this.adapter);
    }

    private void initAnimation() {
        mAnimation = new RotateAnimation(0, 180, Animation.RELATIVE_TO_SELF, 0.5f, Animation.RELATIVE_TO_SELF, 0.5f);
        mAnimation.setDuration(300);
        mAnimation.setFillAfter(true);
        mResetAnimation = new RotateAnimation(180, 0, Animation.RELATIVE_TO_SELF, 0.5f, Animation.RELATIVE_TO_SELF, 0.5f);
        mResetAnimation.setDuration(300);
        mResetAnimation.setFillAfter(true);
    }

    private void initView(AttributeSet attrs) {
        LayoutInflater.from(mContext).inflate(R.layout.edit_spinner, this);
        editText = (EditText) findViewById(R.id.edit_sipnner_edit);
        mRightIv = (ImageView) findViewById(R.id.edit_spinner_expand);
        mRightIv.setOnClickListener(this);

        mRightImageTopView = findViewById(R.id.edit_spinner_expand_above);
        mRightImageTopView.setOnClickListener(this);
        mRightImageTopView.setClickable(false);
        //mRightIv.setRotation(90);
        editText.addTextChangedListener(this);
        tArray = mContext.obtainStyledAttributes(attrs,
                R.styleable.EditSpinner);
        editText.setHint(tArray.getString(R.styleable.EditSpinner_hint));
        editText.setTextSize(18);

        int imageId = tArray.getResourceId(R.styleable.EditSpinner_rightImage, 0);
        if (imageId != 0) {
            mRightIv.setImageResource(imageId);
        }
        int bg = tArray.getResourceId(R.styleable.EditSpinner_Background, 0);
        if (bg != 0) {
            editText.setBackgroundResource(bg);
        }
        tArray.recycle();
    }

    private final void setBaseAdapter(BaseAdapter adapter) {
        if (popupWindow == null) {
            initPopupWindow();
        }
        popupWindow.setAdapter(adapter);
    }

    private void initPopupWindow() {
        popupWindow = new ListPopupWindow(mContext) {
            @Override
            public boolean isShowing() {
                return isPopupWindowShowing;
            }

            @Override
            public void show() {
                super.show();
                isPopupWindowShowing = true;
                mRightImageTopView.setClickable(true);
                mRightIv.startAnimation(mAnimation);
            }
        };
        popupWindow.setOnItemClickListener(this);
        popupWindow.setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_ADJUST_RESIZE);
        popupWindow.setPromptPosition(ListPopupWindow.POSITION_PROMPT_BELOW);
        popupWindow.setWidth(ViewGroup.LayoutParams.WRAP_CONTENT);
        popupWindow.setHeight(ViewGroup.LayoutParams.WRAP_CONTENT);
        popupWindow.setAnchorView(editText);
        popupWindow.setOnDismissListener(new PopupWindow.OnDismissListener() {
            @Override
            public void onDismiss() {
                isPopupWindowShowing = false;
                mRightIv.startAnimation(mResetAnimation);
            }
        });
    }


    @Override
    public final void onClick(View v) {
        if (adapter == null || popupWindow == null) {
            return;
        }
        if (v.getId() == R.id.edit_spinner_expand_above) {
            v.setClickable(false);
            return;
        }
        if (popupWindow.isShowing()) {
            popupWindow.dismiss();
        } else {
            showFilterData("");
        }
    }

    @Override
    public final void onItemClick(AdapterView<?> parent, View view, int position, long id) {
        editText.setText(((BaseEditSpinnerAdapter) parent.getAdapter()).getItemString(position));
        mRightImageTopView.setClickable(false);
        popupWindow.dismiss();
    }

    @Override
    public final void beforeTextChanged(CharSequence s, int start, int count, int after) {

    }

    @Override
    public final void onTextChanged(CharSequence s, int start, int before, int count) {

    }

    @Override
    public final void afterTextChanged(Editable s) {
        String key = s.toString();
        editText.setSelection(key.length());
        if (!TextUtils.isEmpty(key)) {
            showFilterData(key);
        } else {
            popupWindow.dismiss();
        }
    }

    private void showFilterData(String key) {
        if (popupWindow == null || adapter == null || adapter.getEditSpinnerFilter() == null) {
            if (popupWindow != null) {
                popupWindow.dismiss();
            }
            return;
        }
        if (adapter.getEditSpinnerFilter().onFilter(key)) {
            popupWindow.dismiss();
        } else {
            popupWindow.show();
        }
    }

    // 关闭弹窗
    public void dismissPopWindow(){
        if (popupWindow != null) {
            popupWindow.dismiss();
        }
    }
}

5、edit_spinner.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
                android:layout_width="match_parent"
                android:layout_height="wrap_content">

    <EditText
        android:id="@+id/edit_sipnner_edit"
        style="@style/edit_main_bg"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"
        android:inputType="number"/>

    <ImageView
        android:id="@+id/edit_spinner_expand"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignBottom="@+id/edit_sipnner_edit"
        android:layout_alignEnd="@+id/edit_sipnner_edit"
        android:layout_alignRight="@+id/edit_sipnner_edit"
        android:layout_alignTop="@+id/edit_sipnner_edit"
        android:padding="8dp"
        android:src="@drawable/ic_expand_more_black"/>

    <View
        android:id="@+id/edit_spinner_expand_above"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignBottom="@+id/edit_sipnner_edit"
        android:layout_alignLeft="@id/edit_spinner_expand"
        android:layout_alignRight="@id/edit_spinner_expand"
        android:layout_alignTop="@+id/edit_sipnner_edit"
        android:padding="8dp"/>
</RelativeLayout>

2、使用

前期定义：
private InputStream mIs;
private EditSpinner editspinner_w;

调用函数：
loadData();

被调用的函数loadData：
private void loadData() {
	mIs = this.getResources().openRawResource(R.raw.w);  获取raw下的w.txt中的数据，得到mIS流
    editspinner_w.setText("123");  设置显示字符串123
    ArrayList<String> pindianw = getString(mIs);  获取mIS流中的数据
    editspinner_w.setItemData(pindianw);  设置数据
    editspinner_w.dismissPopWindow(); 关闭弹窗
}

被调用的函数getString：
public static ArrayList<String> getString(InputStream inputStream) {
    ArrayList<String> res = new ArrayList<>();
    try {
        InputStreamReader inputStreamReader = new InputStreamReader(inputStream,"UTF-8");
        BufferedReader bufferedReader = new BufferedReader(inputStreamReader);
        String line = "";
        while((line = bufferedReader.readLine()) != null){
            res.add(line);
        }
    } catch (IOException e) {
        e.printStackTrace();
    }
    return res;
}

3、优化

（1）修改输入框的类型，点击输入框，弹出来的键盘是数字键盘：

<EditText
    android:id="@+id/edit_sipnner_edit"
    style="@style/edit_main_bg"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_alignParentLeft="true"
    android:layout_alignParentStart="true"
    android:inputType="number"   <---只需要这里加上这句话
    android:maxLength="5"  添加了额这句话只能输入最多5个字符
    /> 

（2）修改下拉框条目的间距，原始间距太小了，想换大一点

第3个SimpleAdapter.java中修改：

 @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        TextView textView = null;
        if (convertView == null) {
//            textView = (TextView) LayoutInflater.from(mContext).inflate(android.R.layout.simple_spinner_item, null);
            注释掉上面那句，加上下面这句，其中涉及的spinner_text.xml见下面
            textView = (TextView) LayoutInflater.from(mContext).inflate(R.layout.spinner_text, null);
        } else {
            textView = (TextView) convertView;
        }
        textView.setText(Html.fromHtml(getItem(position)));
        return textView;
    }

spinner_text.xml

<?xml version="1.0" encoding="utf-8"?>
<TextView
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@android:id/text1"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:padding="10dp"
    android:textColor="@color/black"
    android:textSize="16sp" />

（3）智能筛选的颜色是000000黑色，而不让它是aa0000红色，修改第3个SimpleAdapter.java中的onFilter函数中的一句话：

    @Override
    public boolean onFilter(String keyword) {
        mCacheData.clear();
        if (TextUtils.isEmpty(keyword)) {
            mCacheData.addAll(mSpinnerData);
            for (int i = 0; i < indexs.length; i++) {
                indexs[i] = i;
            }
        } else {
            StringBuilder builder = new StringBuilder();
            builder.append("[^\\s]*").append(keyword).append("[^\\s]*");
            for (int i = 0; i < mSpinnerData.size(); i++) {
                if (mSpinnerData.get(i).replaceAll("\\s+", "|").matches(builder.toString())) {
                    indexs[mCacheData.size()] = i;
                    mCacheData.add(mSpinnerData.get(i).replaceFirst(keyword, "<font color=\"#000000\">" + keyword + "</font>"));//筛选的颜色是黑色，而不让它是aa0000红色
                }
            }
        }
        notifyDataSetChanged();
        return mCacheData.size() <= 0;
    }

（4）修改输入框的背景色

把这里的背景色去掉：

    <android.support.design.widget.AppBarLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:theme="@style/AppTheme.AppBarOverlay">
        <android.support.v7.widget.Toolbar
            android:id="@+id/toolbar"
            android:layout_width="match_parent"
            android:layout_height="50dp"
            android:background="?attr/colorPrimary"
            app:theme="@style/toolbarTheme"
            app:titleTextAppearance="@style/titleTheme"
            app:logo="@drawable/logo_32"
            app:titleMarginStart="30dp"
            app:popupTheme="@style/AppTheme.PopupOverlay" />

    </android.support.design.widget.AppBarLayout>

把这里的背景色加上：
edit_spinner.xml中

    <EditText
        android:id="@+id/edit_sipnner_edit"
        style="@style/edit_main_bg"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"
        android:inputType="number"/>